condition mean min max ZT0-3 9.755935 9.755935 9.755935 ZT4-7 11.011050000000001 11.011050000000001 11.011050000000001 ZT8-11 10.497341500000001 10.497341500000001 10.497341500000001 ZT12-15 9.4184525 9.4184525 9.4184525 ZT16-19 10.4376455 10.4376455 10.4376455 ZT20-23 9.705292 9.705292 9.705292